CN105214465A - The apparatus and method of integration wet process of FGD dedusting - Google Patents
The apparatus and method of integration wet process of FGD dedusting Download PDFInfo
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- CN105214465A CN105214465A CN201510705636.0A CN201510705636A CN105214465A CN 105214465 A CN105214465 A CN 105214465A CN 201510705636 A CN201510705636 A CN 201510705636A CN 105214465 A CN105214465 A CN 105214465A
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Abstract
The present invention proposes the apparatus and method of integrated wet process of FGD dedusting.Combined by the alkaline desulfurizer on top and the pipe-type electrostatic dust arrester of bottom, wherein device comprises cylindrical shell, side, bottom has gas approach passage, cylinder body bottom space is Buffer Pool, the top of gas approach passage is even gas distribution plate, even gas distribution plate top is electrostatic precipitation district, upper spray pipe is connected booster outlet with lower spray pipe respectively by pipeline, booster import connects bottom neutralization pond, neutralization pond top is provided with alkali lye and adds pipeline, neutralization pond top connects booster b outlet conduit, booster b inlet pipeline connects in the middle part of sedimentation basin, pipeline is had to connect waste liquid outlet bottom sedimentation basin, sedimentation basin top connects booster a outlet, bottom booster a inlet pipeline Connection Pool.The problem such as the efficiency mainly solving the tail flue gas desulfurization and dedusting of Industrial Boiler is low, energy consumption is high, and water reuse rate is low.
Description
Technical field:
The present invention relates to air pollution treatment field, be specifically related to the apparatus and method of integrated wet process of FGD dedusting.
Background technology:
In recent years, along with the generation of haze, increasing people is caused to pay close attention to the pollutant emission situation of air quality and Air Pollutant Emission situation, particularly boiler smoke; The smoke gas treatment starting of station boiler comparatively early, in the strict implement standard of country, at the large-area rebuilding and improving carrying out flue gas, but Industrial Boiler smoke pollution situation but allows of no optimist, at present, the discharge of Industrial Boiler flue gas pollutant exceedes station boiler, becomes the first pollution sources of national industrial trade, and the deep treatment for Industrial Boiler smoke pollution becomes inevitable;
The special emission limit of atmosphere pollution of " emission standard of air pollutants for boilers (GB13271-2014) " that on July 1st, 2014 implements requires: soot dust granule thing≤30mg/Nm
3, SO
2≤ 200mg/Nm
3, nitrogen oxide≤200mg/Nm
3, and the emission limit in key area and eastern part area has required soot dust granule thing≤5mg/Nm
3, SO
2≤ 100mg/Nm
3, this special limit value makes the efficiency of dust collection of fume treatment need reach more than 90%, desulfuration efficiency need reach more than 90%, and more and more stricter emission request makes more Industrial Boiler producer enter in the ranks of tail flue gas environmental transformation;
The desulfurization of Industrial Boiler is divided into dry desulfurization and wet desulphurization two kinds of modes, dry desulfurization generally adopts lime (lime stone) as desulfurizing agent, and have the methods such as in-furnace calcium spraying, the utilization rate of desulfurizing agent is low, and desulfuration efficiency is low, do not reach the limitation standard of country for boiler smoke discharge; Wet desulphurization has limestone-based process, Dual alkali, magnesium oxide method, sodium alkali or ammonia process etc., and limestone-based process is due to system complex, and running pollutes high, and easily causes the problems such as system jams, and general industry boiler is of little use; Other sulfur methods due to the alkalescence of absorbent strong, with SO
2reaction speed fast, absorptivity is high, and sorbent utilization is high, and general desulfuration efficiency can reach more than 90%, but it is more complicated also to there is wastewater treatment, and initial cost is large, and operating cost is also higher;
Dedusting method conventional in Industrial Boiler dedusting is also divided into dry type and wet type two kinds, what dry method was the most frequently used has electric precipitation and bag-type dust, these two kinds of mode equipment are huge, investment and operating cost large, and efficiency of dust collection is lower, do not reach the discharge standard of existing national regulation, the water-bath type dust cleaner that wet dust removal is conventional and gallet water curtain dust collector and wet cottrell, the efficiency of dust collection of water-bath type and granite with water film formula dedusting method is higher, but water consumption is larger, cost of sewage disposal is high, and wet cottrell small volume, due to the existence of electric field force, efficiency of dust collection is very high, concentration of emission≤the 5mg/Nm of flue gas can be reached
3, a large amount of in station boiler application.
Summary of the invention:
Patent of the present invention provides a kind of apparatus and method of integrated wet process of FGD dedusting, the problem such as the efficiency mainly solving the tail flue gas desulfurization and dedusting of Industrial Boiler is low, energy consumption is high, and water reuse rate is low.
Technical scheme of the present invention is: the device of integrated wet process of FGD dedusting is combined by the alkaline desulfurizer on top and the pipe-type electrostatic dust arrester of bottom, wherein device comprises cylindrical shell, cylindrical shell is the cylinder of a setting, side, bottom has gas approach passage, the cylinder body bottom space of the bottom of gas approach passage is Buffer Pool, the top of gas approach passage is even gas distribution plate, the equal plate top of gas is electrostatic precipitation district, the anode tube of some cellular interior hexagonals is hung in the cylindrical shell of electrostatic precipitation district part, the upper space of each anode tube is equipped with shower nozzle, some shower nozzles are by pipeline and be unified into lower spray pipe, cylindrical shell top is provided with exhanst gas outlet, twice upper spray pipe is provided with between exhanst gas outlet and electrostatic precipitation district, upper spray pipe is connected booster outlet with lower spray pipe respectively by pipeline, booster import connects bottom neutralization pond, neutralization pond top is provided with alkali lye and adds pipeline, neutralization pond top connects booster b outlet conduit, booster b inlet pipeline connects in the middle part of sedimentation basin, pipeline is had to connect waste liquid outlet bottom sedimentation basin, sedimentation basin top connects booster a outlet, bottom booster a inlet pipeline Connection Pool.
Combined wet-type flue gas desulfurization and dedusting dress method, flue gas is by gas approach pipeline access to plant, through the backward upper flowing of airflow uniform distribution plate, flue gas flow rate is between 3 ~ 4m/s, get desired value, enter the electrostatic precipitation district of bottom, flow through cellular interior hexagonal anode tube, anode tube center is the cathode line of joining with its pole, the bottom-up flowing of flue gas, flue gas flow rate 3 ~ 4m/s, cathode line is discharged under the effect of extraneous high voltage source, the materials such as the grit in the flue gas of Bottomhole pressure and water under electric field action, anode pipe move, and stick in anode tube, flue gas after purification is discharged from top, cleaned under the effect of the absorbing liquid of the interval ejection of the shower nozzle of anode tube in lower spray pipe, Buffer Pool bottom liquid access to plant after cleaning,
Bottom of device is the Buffer Pool of waste liquid after desulfurization, the water of Buffer Pool enters in settling tank through booster a pumping, settling tank supernatant liquor enters in neutralization pond through booster b pumping, in neutralization pond, add pipeline by alkali lye to add alkali lye and regulate the circulation of the absorbing liquid after PH to enter in upper spray pipe and lower spray pipe, the water of settling tank bottom is expelled to sewage treatment unit;
Absorbing liquid sprays in cylindrical shell by nozzle atomization in two-layer upper spray pipe, be dispersed into tiny drop and cover the whole section of cylindrical shell, alkali lye in these drops contacts with flue gas adverse current in cylindrical shell, flue gas flow rate keeps 3.2 ~ 4m/s, there is mass transfer and absorption reaction, absorbing liquid is generally alkaline solution as sodium hydroxide solution, and sodium carbonate liquor or magnesia are dissolved in the magnesium hydroxide solution that water clears up rear formation.
The present invention has following beneficial effect: the application mainly solves the problems such as the efficiency of the tail flue gas desulfurization and dedusting of Industrial Boiler is low, energy consumption is high, and water reuse rate is low.Forming integrated wet-desulfurizing dust remover and method by pipe-type electrostatic dedusting and alkaline desulfurization being combined as a whole, first can share a set of water circulation system, investment reduction; Secondly the treating capacity of recirculated water reduces, and operating cost greatly reduces; Again, the interaction of desulfurization and dedusting, makes the desulfurization dust-removing efficiency of device greatly improve, and the concentration of emission of exhanst gas outlet reduces.
Accompanying drawing illustrates:
Accompanying drawing 1 is structural representation of the present invention;
Accompanying drawing 2 is A-A views of accompanying drawing 1.
1-Buffer Pool in figure, 2-gas approach passage, 3-cylindrical shell, 4-electrostatic precipitation district, 5-lower spray pipe, 6-upper spray pipe, 7-exhanst gas outlet, 8-booster, 9-neutralization pond, 10-sedimentation basin, 11-waste liquid outlet, 12-alkali lye adds pipeline, 13-anode tube, 14-shower nozzle, 15-airflow uniform distribution plate, 16-booster a, 17-booster b.
Detailed description of the invention:
Below in conjunction with accompanying drawing, the invention will be further described:
Shown in Fig. 1 composition graphs 2, the top of the device of integration wet process of FGD dedusting is alkaline desulfurization, bottom is pipe-type electrostatic dedusting, device comprises cylindrical shell 3, cylindrical shell 3 is the cylinder of a setting, side, bottom has gas approach passage 2, cylindrical shell 3 bottom space of the bottom of gas approach passage 2 is Buffer Pool 1, the top of gas approach passage 2 is airflow uniform distribution plate 15, the air-flow of airflow uniform distribution plate 15 pairs of flue gases has the effect of current-sharing, flue gas after current-sharing is conducive to electrostatic precipitation and alkali lye sulphur removal, airflow uniform distribution plate 15 top is electrostatic precipitation district 4, the anode tube 13 of some cellular interior hexagonals is hung in the cylindrical shell 3 of electrostatic precipitation district 4 part, anode tube 13 center is the cathode line of joining with its pole, under electric field action, anode tube 13 is used for adsorbing the grit in flue gas, water and part SO
2material, the upper space of each anode tube 13 is equipped with shower nozzle 14, some shower nozzles 14 are by pipeline and be unified into lower spray pipe 5, shower nozzle 14 and lower spray pipe 5 are used for anode purge pipe 13, cylindrical shell 3 top is provided with exhanst gas outlet 7, at least twice upper spray pipe 6 is provided with between exhanst gas outlet 7 and electrostatic precipitation district 4, upper spray pipe 6 is connected booster 8 with lower spray pipe 5 respectively by pipeline and exports, booster 8 import connects bottom neutralization pond 9, neutralization pond 9 top is provided with alkali lye and adds pipeline 12, neutralization pond 9 top connects booster b17 outlet conduit, booster b17 inlet pipeline connects in the middle part of sedimentation basin 10, pipeline is had to connect waste liquid outlet 11 bottom sedimentation basin 10, sedimentation basin 10 top connects booster a16 outlet, bottom booster a16 inlet pipeline Connection Pool 1,
Combined wet-type FGD dust collection method is as follows: flue gas is by gas approach pipeline 2 access to plant, through the backward upper flowing of airflow uniform distribution plate 15, flue gas flow rate is between 3 ~ 4m/s, enter the electrostatic precipitation district 4 on top, flow through cellular interior hexagonal anode tube 13, cellular interior hexagon anode tube 13 increases the contact area of anode tube 13 and gas, be conducive to the efficiency improving electrostatic precipitation, anode tube 13 center is the cathode line of joining with its pole, the bottom-up flowing of flue gas, flue gas flow rate 3 ~ 4m/s, cathode line is discharged under the effect of extraneous high voltage source, the materials such as the grit in the flue gas of Bottomhole pressure and water under electric field action, anode pipe 13 move, and stick in anode tube 13, flue gas after purification is discharged from top, cleaned under the effect of the absorbing liquid of the interval ejection of the shower nozzle 14 of anode tube 13 in lower spray pipe 5, Buffer Pool 1 bottom liquid access to plant after cleaning,
The dust-cleaning principle of wet cottrell is as follows: cellular interior hexagonal anode tube vertical hanging is on the fixing channel-section steel of dust remover roof, and anode tube 13 center is the cathode line of joining with its pole.The bottom-up flowing of flue gas (flue gas flow rate 3 ~ 4m/s), cathode line is discharged under the effect of extraneous high voltage source, and the materials such as the grit in the flue gas of Bottomhole pressure and water under electric field action, anode pipe move, and stick in anode tube, and in this process, part SO
2have also been obtained and remove.Smog discharge temperature due to Industrial Boiler is general higher, is between 160 DEG C ~ 220 DEG C, therefore the metal anode pipe of dedusting anode tube material selection heatproof, and anode tube needs to have stronger corrosion resistance avoids SO
2corrosiveness.Flue gas after purification is discharged from dust remover roof and is entered chimney, and anode tube is cleaned under the effect of interval water spray.Tubular electrostatic precipitator has that volume is little, system is simple and the advantage that efficiency of dust collection is high.
Bottom of device is the Buffer Pool 1 of waste liquid after desulfurization, the water of Buffer Pool 1 enters in settling tank 10 through booster a16 pumping, settling tank 10 can by the waste liquid sedimentation separation of Buffer Pool 1, settling tank 10 supernatant liquor enters in neutralization pond 9 through booster b17 pumping, in neutralization pond 9, add pipeline 12 by alkali lye to add alkali lye and regulate the circulation of the absorbing liquid after PH to enter in upper spray pipe 6 and lower spray pipe 5, the water of settling tank 10 bottom is expelled to sewage treatment unit; The intermittent shower water that bottom dust removal part needs is got from neutralization pond 9, to spray in backward lower Buffer Pool bottom dedusting access to plant thus to enter in water circulation system.
Absorbing liquid in neutralization pond 9 is sprayed into by nozzle atomization in cylindrical shell 3 in two-layer upper spray pipe 6, be dispersed into tiny drop and cover the whole section of cylindrical shell 3, alkali lye in these drops contacts with flue gas adverse current in cylindrical shell 3, flue gas flow rate keeps 3.2 ~ 4m/s, there is mass transfer and absorption reaction, the SO in flue gas
2,sO
3absorbed Deng there is neutralization reaction with the NaOH in drop, and the grit of part is taken away by drop.Flue gas through purification is discharged from top after demist.SO
2by alkali liquor absorption, flue gas obtains desulfurizing and purifying, and in this process, some grits have also been obtained and remove.Owing to have passed through the cooling effect in dedusting region, so SO
2absorption rate in desulfurization zone is accelerated to some extent compared to during high-temperature flue gas, and desulfuration efficiency is improved.Flue gas to leave behind desulfurization zone after demist effect, enters smoke stack emission.Absorbing liquid is generally alkaline solution as sodium hydroxide solution, and sodium carbonate liquor or magnesia are dissolved in the magnesium hydroxide solution that water clears up rear formation.Absorbing liquid falls into Buffer Pool 1 after settling tank 10, neutralization pond 9 alkali lye regulate pH value, reenters in circulating pump, is injected in desulfurizing tower as absorbing liquid.
Alkali absorption method is as the efficient fume desulphurization method of one, there is system liquid-gas ratio little, operation energy consumption is low, desulfurization absorbing liquid is generally alkaline solution as sodium hydroxide solution, sodium carbonate liquor or magnesia are dissolved in the magnesium hydroxide solution that water clears up rear formation, and this alkali lye does not have crystal to separate out or scale formation.Alkaline absorbent method desulfuration efficiency is high; System run all right is reliable; Waste water is few, produces the advantages such as secondary pollution hardly.
The alkali lye supplemented adds in neutralization pond 9, PH in regulating reservoir is to suitable value, enter in upper spray pipe 6 through booster 8 pumping, the drop that upper spray pipe 6 sprays is mainly used in flue gas desulfurization, and the water that lower spray pipe 5 sprays is mainly used in the anode tube 13 of rinsing dedusting area.Shower water all flows downward, and arrive in Buffer Pool 1, enter in settling tank 10 through pump pumping, supernatant liquor enters in neutralization pond 9 through pump and completes circulation, and the waste liquid of lower floor enters Waste Water Treatment.
This device and method can realize smoke desulfurization efficiency and reach more than 90%, dedusting exiting flue gas concentration≤5mg/Nm
3, discharge reaches the strictest existing discharge standard; Dust waste water recycling can be realized, greatly reduce the wastewater discharge in running; The initial cost of desulfurization and dedusting can be reduced, and the energy consumption in running can be reduced, reach the object of energy efficiency.
Claims (2)
1. the device of an integrated wet process of FGD dedusting, it is characterized in that: combined by the alkaline desulfurizer on top and the pipe-type electrostatic dust arrester of bottom, wherein device comprises cylindrical shell (3), cylindrical shell (3) is the cylinder of a setting, side, bottom has gas approach passage (2), cylindrical shell (3) bottom space of the bottom of gas approach passage (2) is Buffer Pool (1), the top of gas approach passage (2) is airflow uniform distribution plate (15), airflow uniform distribution plate (15) top is electrostatic precipitation district (4), the anode tube (13) of some cellular interior hexagonals is hung in the cylindrical shell (3) of electrostatic precipitation district (4) part, the upper space of each anode tube (13) is equipped with shower nozzle (14), some shower nozzles (14) are by pipeline and be unified into lower spray pipe (5), cylindrical shell (3) top is provided with exhanst gas outlet (7), twice upper spray pipe (6) is provided with between exhanst gas outlet (7) and electrostatic precipitation district (4), upper spray pipe (6) is connected booster (8) outlet with lower spray pipe (5) respectively by pipeline, booster (8) import connects neutralization pond (9) bottom, neutralization pond (9) top is provided with alkali lye and adds pipeline (12), neutralization pond (9) top connects booster b (17) outlet conduit, booster b (17) inlet pipeline connects sedimentation basin (10) middle part, sedimentation basin (10) bottom has pipeline to connect waste liquid outlet (11), sedimentation basin (10) top connects booster a (16) outlet, booster a (16) inlet pipeline Connection Pool (1) bottom.
2. an integrated wet flue gas desulfurization and dust removal method, comprise the following steps, flue gas is by gas approach pipeline (2) access to plant, through the backward upper flowing of airflow uniform distribution plate (15), flue gas flow rate is between 3 ~ 4m/s, get desired value, enter the electrostatic precipitation district (4) on top, flow through cellular interior hexagonal anode tube (13), anode tube (13) center is the cathode line of joining with its pole, the bottom-up flowing of flue gas, flue gas flow rate 3 ~ 4m/s, cathode line is discharged under the effect of extraneous high voltage source, the upper motion of grit in the flue gas of Bottomhole pressure and water anode pipe (13) under electric field action, and stick in anode tube (13), flue gas after purification is discharged from top, cleaned under the effect of the absorbing liquid of the interval ejection of the shower nozzle (14) of anode tube (13) in lower spray pipe (5), Buffer Pool (1) bottom liquid access to plant after cleaning,
Bottom of device is the Buffer Pool (1) of waste liquid after desulfurization, the water of Buffer Pool (1) enters in settling tank (10) through booster a (16) pumping, settling tank (10) supernatant liquor enters in neutralization pond (9) through booster b (17) pumping, in neutralization pond (9), add pipeline (12) by alkali lye to add alkali lye and regulate the circulation of the absorbing liquid after PH to enter in upper spray pipe (6) and lower spray pipe (5), the water of settling tank (10) bottom is expelled to sewage treatment unit; Absorbing liquid is sprayed into by nozzle atomization in cylindrical shell (3) in two-layer upper spray pipe (6), be dispersed into tiny drop and cover the whole section of cylindrical shell (3), alkali lye in these drops contacts with cylindrical shell (3) interior flue gas adverse current, flue gas flow rate keeps 3.2 ~ 4m/s, mass transfer and absorption reaction occur, and absorbing liquid is the magnesium hydroxide solution that alkaline solution of sodium hydroxide, sodium carbonate liquor or magnesia are dissolved in that water clears up rear formation.
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| CN106178844A (en) * | 2016-08-08 | 2016-12-07 | 四川明晶光电科技有限公司 | A kind of big contacting surface sulfur dioxide absorbing tower |
| CN107998792A (en) * | 2016-10-29 | 2018-05-08 | 佛山市原创动力科技有限公司 | A kind of multistage combined desulfation dust-extraction device |
| CN107119751A (en) * | 2017-07-06 | 2017-09-01 | 衡阳师范学院 | A kind of high efficiency wind water making device |
| CN107119750A (en) * | 2017-07-06 | 2017-09-01 | 衡阳师范学院 | Wind-force water making device |
| CN108080149B (en) * | 2017-12-11 | 2023-12-22 | 浙江碧净环保科技有限公司 | Honeycomb type anode tube wet electric dust collector and operation method thereof |
| CN108080149A (en) * | 2017-12-11 | 2018-05-29 | 浙江碧净环保科技有限公司 | A kind of wet electric precipitator of honeycomb type anode tube and its operating method |
| CN108479363A (en) * | 2018-04-13 | 2018-09-04 | 宁波清智环保科技有限公司 | Environmentally friendly emission-control equipment |
| WO2020083223A1 (en) * | 2018-10-22 | 2020-04-30 | 上海必修福企业管理有限公司 | Exhaust gas treatment system and method |
| CN110090546A (en) * | 2019-05-30 | 2019-08-06 | 江苏新聚环保科技有限公司 | Emission-control equipment |
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| CN117547948A (en) * | 2023-10-20 | 2024-02-13 | 山东大学 | Recycling carbon capturing system based on wet electrostatic precipitator |
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Application publication date: 20160106 |
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